src/ai/ai.cpp

   1 #include "Chaser.hpp"
   2 #include "Controller.hpp"
   3 #include "RandomWalk.hpp"
   4
   5 #include "../world/Entity.hpp"
   6
   7 #include <glm/glm.hpp>
   8
   9
  10 namespace blank {
  11
  12 Chaser::Chaser(Entity &ctrl, Entity &tgt) noexcept
  13 : Controller(ctrl)
  14 , tgt(tgt)
  15 , speed(0.002f)
  16 , stop_dist(5 * 5)
  17 , flee_dist(3 * 3) {
  18
  19 }
  20
  21 Chaser::~Chaser() {
  22
  23 }
  24
  25 void Chaser::Update(int dt) {
  26         glm::vec3 diff(Target().AbsoluteDifference(Controlled()));
  27         float dist = dot (diff, diff);
  28         // TODO: line of sight test
  29         if (dist > stop_dist) {
  30                 Controlled().Velocity(normalize(diff) * speed);
  31         } else if (dist < flee_dist) {
  32                 Controlled().Velocity(normalize(diff) * -speed);
  33         } else {
  34                 Controlled().Velocity(glm::vec3(0.0f));
  35         }
  36 }
  37
  38
  39 Controller::Controller(Entity &e) noexcept
  40 : entity(e) {
  41
  42 }
  43
  44 Controller::~Controller() {
  45
  46 }
  47
  48
  49 RandomWalk::RandomWalk(Entity &e) noexcept
  50 : Controller(e)
  51 , time_left(0) {
  52
  53 }
  54
  55 RandomWalk::~RandomWalk() {
  56
  57 }
  58
  59 void RandomWalk::Update(int dt) {
  60         time_left -= dt;
  61         if (time_left > 0) return;
  62         time_left += 2500 + (rand() % 5000);
  63
  64         constexpr float move_vel = 0.0005f;
  65
  66         glm::vec3 new_vel = Controlled().Velocity();
  67
  68         switch (rand() % 9) {
  69                 case 0:
  70                         new_vel.x = -move_vel;
  71                         break;
  72                 case 1:
  73                         new_vel.x = 0.0f;
  74                         break;
  75                 case 2:
  76                         new_vel.x = move_vel;
  77                         break;
  78                 case 3:
  79                         new_vel.y = -move_vel;
  80                         break;
  81                 case 4:
  82                         new_vel.y = 0.0f;
  83                         break;
  84                 case 5:
  85                         new_vel.y = move_vel;
  86                         break;
  87                 case 6:
  88                         new_vel.z = -move_vel;
  89                         break;
  90                 case 7:
  91                         new_vel.z = 0.0f;
  92                         break;
  93                 case 8:
  94                         new_vel.z = move_vel;
  95                         break;
  96         }
  97
  98         Controlled().Velocity(new_vel);
  99 }
 100
 101 }